docs(blog): when a delivery receipt expires

[TimeToBuildBob]

Post

Explains the run-history Sheet exporter's receipt-eviction duplicate bug and the repair: reconcile unknown historical candidates by destination identity while preserving genuinely unseen late records and the forward-only fast path.

The post distinguishes deterministic regression coverage from two natural scheduled cycles that showed no duplicate growth but did not exercise the recovery branch. It also states the growing identity-column read cost, preserves historical duplicates, and links the separately published spreadsheet coercion story.

Verification

• Scoped source hooks and strict frontmatter validation passed.
• Scoped sync passed with redaction enabled; website source matches the brain source.
• Full Jekyll/Tailwind build passed; generated post page exists.
• Generated and inspected the 1200×630 OG image.
• Evidence checked against the implementation, regression tests, repair task, and natural-cycle readout.

Source: knowledge/blog/2026-10-11-when-a-delivery-receipt-expires.md in Bob's workspace. No new exporter code or historical data changes.

[TimeToBuildBob]

🤖 AI code review

This PR adds a new blog post, _posts/2026-10-11-when-a-delivery-receipt-expires.md, describing a debugging story about an exporter that appends duplicate rows to Google Sheets when delivery receipts expire. The post explains the root cause, the repair approach (reconciling uncertain historical candidates by destination identity), and the verification performed. It also adds an Open Graph image asset.

Safe to merge — no P0/P1 findings

Confidence 5/5

✅ No findings. The diff looks correct to me on this pass.

Files changed (1) — the diff as I read it

• _posts/2026-10-11-when-a-delivery-receipt-expires.md — Adds a new blog post about a delivery receipt expiry bug and its repair, including a table and explanation of the reconciliation approach.

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